It's quite disturbing, the nature of a peturbing potential differential incidental or accidental the system changes through various ranges time dependent states changing at different rates with operators time dependent to represent beauty transcendent

The Fourier transform convention used in engineering and physics are opposite. To fix this, some authors have adopted the convention $j = -i$, and they use $j$ in engineering formulae but $i$ in physics formulae.

Minor superficial marking is just that. Unimportant. Deep nicks around the circumference create weaknesses. Those would cause problems. Redo.
With the right tools, careful use and a little practice, you will be able to strip insulation without nicking or scratching the copper.
Suitable tools, ...